Casein glue



Patented Aug. 26, 1924.

HENRY L. PBESTHOLD'I', OF MINNEAPOLIS, MINNESOTA.

CASEIN GLUE.

No Drawing. Application filed April 17, 1922. Serial No. 554,195.

To all whom it may concern: sition, will take place. After these chem- 45 Be it known that I, HENRY L. PRESTHOLDT, ical reactions have taken place, the emulsion a citizen of the United States, residing at is adapted to be used as a glue or as a coat- Minneapolis, inthe county of Hennepin and ing or to be commingled with other sub- State of Minnesota, have invented certain stances such as paint or calcimine, which new and useful Improvements in Casein contain certain color pigments. vWhen de- 50 Glues; and I do hereby declare the followsired, however, the color-producing piging to be a full, clear, and exact description ments may be commingled with the dry of the invention, such as will enable others composition. When the composition is to skilled in the art to which it appertains to be used simply as a glue, no additions to make and use the same. the formula given, except water, will be re- 85 My present invention provides a new comquired. position of matter, herein designated as Casein, dextrine, and starch provide the casein glue, but which, from its broader colloids. Calcium hydroxide in solution aspect, is an adhesive composition adapted with casein forms a calcium caseinate, im-

to be used, by itself or commingled with parting waterproof qualities to the glue on other substances, as an adhesive coating. powder. Sodium hydroxide digests the In this improved adhesive composition, starch and is a casein solvent. The hycasein is used as the main adhesive base 'droxide of soda, in combination with caland is commingled with dextrine, starch, cium hydroxide, would effect the solution calcium hydroxide, magnesium oxide and of the glue powder, but it would quickly 66 sodium hydroxide. In this composition, the become gelatinous and set up. Magnesium dextrine, which is a converted starch, also oxide is introduced for the purpose of rehas adhesive qualities. The starch is used tarding this process, which it does and imto insure against the possibility of suphuric parts to the glue solution a liquid life of acid reactions. several hours. 70

I have obtained a very highly efficient WhatI claim is: glue or adhesive by the use of the above 1. An adhesive composition comprising a noted substances with the following formixture of casein, dextrine, starch, calcium 3o mula: hydroxide, magnesium oxide and sodium hydroxide. Casell} 50 to 75 2. An adhesive composition made in ac- Dextllne 2 to 8 cordance with the following formula: Starch a 3 to 12 Parts 35 Calcium hydroxi e 6 to 12 Magnesium oxide 10 to 20 giggi g g :3 g Sodium hydroxide 2 to 8 Starch 3 to 12 The above noted substances are commin- Calcium hydroxide 6 to 12 gled in dry powdered form and are sold in Magnesium oxide 10 to 20 0 this dry condition. When the adhesive is Sodium hydroxide 2 to 8 8 to be used, 1t Wlll be mtroduced into water In testimony whereof I aflix y Signa to form anemulsion and it is then, of course, that the chemical reactions that develop the adhesive qualities of the compoture.

HENRY L. PRE STHOLDT. 

